Roll polisher for rolling mills



ROLL POLISHER FOR ROLLING MILLS Filed Aug. 21, 1935 2 Sheets- Sheet 1 Sept. 20, 1938. w A 2,130,709

ROLL POLISHER FOR ROLLING MILLS Filed Aug. 21, 1935 2 Sheets-Sheet 2 Patented Sept. 20, 1938 UNITED STATES PATENT OFFICE Application August 21, 1935, Serial No. 37,223 In Great Britain August 29, 193 4 3 Claims.

This invention relates to rolling mills, for example, those employed in the tin plate industry for rolling steel bars in the production of black plates. The invention has more particular reference to means for cleaning and polishing the rolls, whereby scale or grit and other foreign matter which is liable to become embedded in the rolls during the rolling operation are removed, thus eliminating a considerable amount of spoiling of subsequently rolled bars and plates.

In my British specification No. 299,510 a roll cleaningand polishing device is described, by which a polishing element was pressed into engagement with the roll, through the medium of a pedal device. It is found in practice that the pressure on the pedal may be so great as to break thepolishing blocks and also cause them to bite into and damage the operative surface of the 1 rolls.

An object of the present invention is to provide safety means in roll cleaning and polishing apparatus of the character described, whereby damage to the roll by the polisher and to the polishing blocks is prevented.

A further object of the invention is to provide an improved cleaning and polishing apparatus adapted for use with the upper roll, whereby such may be retained in the operative position without interference with the passage of the rolled bars from the behinder, over the top of the roll to the rollerman or may be readily transferred to an inoperative position during rolling.

The invention comprises means for cleaning and polishing the rolls of rolling mills, comprising a pivotally mounted support carrying abrading means, and adjusting means for moving the abrading means into, and out of, contact with the roll, said adjusting means including a safety clude a spring device which is arranged to preclu-de the transmission of too great a pressure. The invention also consists in a spring pressed .cleaning or polishing device adapted to be mounted in association with the upper roll on the behinders side of the mill.

Such cleaning or polishing device may be permanentlylocated in position or may be mounted upon arms or the like whereby the polisher may be swung upwardly out of the way when the mill is rolling.

The abrading blocks are preferably mounted resiliently in a channel element and each block is carried by a holder formed of metal or an alloy, the blocks and holders having complementary securing means such as a tenon or an undercut groove.

In the accompanying drawings which diagrammatically illustrate the invention:-

Figure 1 is an elevation of a mill looking from the behinders side.

Figure 2 is a partial sectional view corresponding to Figure 1.

Figures 3 and 4 are details of modified pressure controlling devices.

Figures 5 and 6 are elevation and cross section of'the preferred form of polishing device.

In carrying the invention into effect, according to one convenient mode, by way of example, a support or carrier is provided for a polish ing element, which extends parallel with the axis of the rolls H and I2. The polisher support extends parallel as aforesaid for any desired length equal to or shorter than the length of the roll. The support is located in association with the lower roll H of the mill, and on the rollermans side of the roll below the horizontal plane passing through the axis of the roll. The support may if desired be located in association with the roll in similar fashion on the behinders side of the roll.

The support If) is pivotally mounted upon a bar 59, carried by suitable members, for example, a pair of screw eyes 13, which are carried by a part Id of the housing or by an independent sup port on the floor, About midway'of its length a plate i5 is fastened to the support and extends downwardly to provide an arm. This arm lies within a stirrup element it mounted upon one end of a bar or connecting rod l'l extending horizontally below the roll to a position at the behinders side of the roll.

The bar or connecting rod I1 is provided with another stirrup I 8 at its forward end which is pivotally connected to a lever arm l9 mounted upon a horizontal shaft 20 parallel with the axis of the roll and carried in suitable bearings 2| fastened to the floor or to the housing of the mill.

At one end of the shaft a ratchet wheel 22 is provided co-operating with a pawl 23 by which the shaft may be held in its adjusted position of rotation. At the other end the shaft carries an operating handle or lever 24 which is cranked, so that the portion adapted to be grasped by the operator extends upwardly and is located at the side of the machine out of the way of the roll. As an alternative, the shaft 20 may be extended to the side of the mill and the operating lever mounted on such extension.

The arrangement is such that on exerting a pull on the cranked lever 24, the polishing block support In is pivoted toward the roll so as to bring the polishing blocks 25 which may comprise emery, carborundum, or any known abrasive element into contact with the operating surface and thus remove scale or other matter and clean such surface.

The cranked arrangement of the operating lever 24 is such that in the event of the pressure exerted exceeding a predetermined amount the lever will bend, twist or break, and thus prevent the polishing blocks biting into the roll or the fracturing of the blocks.

A similar effect would be obtained by forming the lever 24 of a relatively soft quality material which would permit a bending ofthe lever to take place.

According to another arrangement, the lever 24 may be connected to the shaft 20 by means of a soft cotter-pin which would shear in the event of undesirable pressure being applied.

According to a modified arrangement, see Figure 3, a device in the nature of a shock absorber as used on motor cars may be provided between the lever 24 and the shaft 20.

Thus the lever 24 may be mounted upon or formed with a disc 26 fitting loosely on the shaft 20 and having a friction surface 21 adapted to abut against a friction surface 28 on a disc 29 fixed on the shaft. A spring 30 on the shaft presses the discs 2! and 28 together to create sufficient friction for normal rotation of the shaft by the lever, but such that on excessive I pressure being applied slip occurs between the discs.

The tension of the spring 30 may be adjusted by a nut 3| threaded on the shaft. With such an arrangement replacement of the lever 24 in case of breakage is avoided and also faults due to faulty material in the lever would be eliminated.

It will be appreciated that when the lever 24 is operated to bring the blocks 25 into cleaning engagement with the roll the pawl 23 will engage an appropriate tooth on the ratchet wheel 22 and hold the parts in their adjusted position.

According to another feature, see Figure 4, the connection between the end of the connecting rod I! and the stirrup l8 may be by means of a suitable spring. Thus the connecting rod is passed'through an aperture in the stirrup and a spring 32 threaded on that portion of the rod I! located within the stirrup, an adjustable nut 33 on the connecting rod providing a suitable abutment for the other end of the spring.

An advantage of utilizing this spring feature is that the polishing blocks 25 are held resiliently in engagement with the roll and the spring 32 acts as a shock absorber to take up any jerky movements of the roll II which occur during thev operation of the mill.

According to a further feature of the invention, a cleaning and polishing element is mounted in association with the upper roll l2 on the behinders side of the machine, being located about midway between the horizontal plane containing the axis of the roll and the bite of the rolls.

The polishing element support 34 is pivotally mounted upon a shaft 35 carried by brackets 36 on the housing of the mill and extends upwardly therefrom.

A spindle 3! passes through eyes in the support 34 and is associated at its ends with screw eyes 38 which are threaded through plates 39 on the sides of the housing of the roll, such screw eyes having springs 40 which force them inwardly toward the roll, whereby the polishing element is pressed into contact therewith. Tension of the springs 49 may be suitably adjusted by nuts 4| on the screw eyes.

According to the preferred form, see Figures and 6, the polishing elements comprise a series of emery, Carborundum or like abrading blocks 25 which are mounted in a channel element 49 carried by the support III. For this purpose the support comprises a back plate having its ends bent upwardly to form end walls 50 between which the channel member 49 is located.

The channel member 49 is rigidly connected to the back plate by means of bolts 5|, adjustment being provided if necessary by means of washers 52. A series of compression springs 53 is provided between the back plate and each individual block, such springs passing through apertures 54 in the channel member. The adjace nt faces of the blocks are obliquely inclined so that aneffective continuous cleaning and polishing surface is provided.

The portion of each block lying within the channel member may be encased in a steel casing suitably shaped to the obliquity of the block surface. Such casing prevents damage to the blocks from relative movement between the block and the channel member and also forms an engaging surface for the spring.

Preferably, however, the polishing blocks are mounted in individual holders 55 (metal or alloy) by forming tenons or tongues 56 on the block and inserting them in undercut grooves in the holders. The blocks may be cemented in position in the holders 55.

Theholders are provided with lateral projection 55a engaging the channel member 49. The holders 55 may be formed of metal or an alloy.

The longitudinal positioning of the blocks in the channel member 49 is effected by adjusting bolts SIengaging end pieces 58.

It is preferred that the polisher shall be capable of movement parallel to the axis of the roll. For this purpose the hinge element 60 carrying the polishing member is adapted to slide to and fro along the supporting bar 59 hereinbefore referred to. The mill housing. is bored to accommodate a coupling rod 6| which extends between the channel member or the back plate of the polisher and an operating lever 62 mounted outside the housing.

The axial movement is effected against the action of a returning spring 63 which may surroundthe coupling rod and abut against the housing and a collar on the rod.

Alternatively the axial movement may be effected against the return spring 63 which may surround the coupling rod 6| and abut against the housing and the hinge element 69.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is: V

1. Means for cleaning and polishing the rolls of rolling mills comprising a pivotally mounted support carrying abrading means, said abrading means extending substantially throughout the length of the roll and comprising a plurality of blocks of abrasive material, adjusting means for pivoting said support to positively move said abrading means into and out of contact with the roll, said adjusting means comprising a rock shaft, linkage between the shaft and said support, an operating lever freely mounted on said shaft and co-operating friction elements on said shaft and lever for transmitting the movements of the operating lever to said shaft but adapted to preclude pressure of the abrading means against the roll which is higher than a predetermined pressure.

,2. Means for cleaning and polishing the rolls of rolling mills, comprising a pivotally mounted support carrying abrading means, said abrading means extending substantially throughout the length of the roll and comprising a plurality of blocks of abrasive material, adjusting means for pivoting said support to positively move said abrading means into and out of contact with the roll, said adjusting means incorporating a friction device through which the pressure is applied and adapted to slip when said predetermined pressure is exceeded.

3. Means for cleaning and polishing the rolls of rolling mills, comprising a pivotally mounted support carrying abrading means, said support comprising downwardly depending arms, said abrading means extending substantially throughout the length of the roll and comprising a plurality of blocks of abrasive material, adjusting means for pivoting said support to positively move said abrading means into and out of contact with the roll, said adjusting means incorporating a friction device through which the pressure is applied and adapted to slip when said predetermined pressure is exceeded, said adjusting means also including telescopic elements which may be readily separated to permit the abrading device being swung out of the way when the mill is in operation.

SAMUEL WILLIAMS. 

